For most of U. S. history, an all-stock and a 60-40 portfolio have run neck-and-neck for trailing 30-year returns.
Source: [MarketWatch](https://www.marketwatch.com/story/youre-probably-too-invested-in-equities-why-a-60-40-portfolio-is-still-the-smart-way-to-go-853daade?mod=mw_rss_topstories)